제출 #1261270

#제출 시각아이디문제언어결과실행 시간메모리
1261270medaa별들과 삼각형 (IZhO11_triangle)C++20
100 / 100
226 ms5860 KiB
#include<bits/stdc++.h> using namespace std; #define ll long long #define endl '\n' void SOLVE() { int n; cin >> n; vector<pair<int, int>> a(n); map<int, int> x, y; for(auto &[u, v] : a){ cin >> u >> v; x[u]++; y[v]++; } ll answer = 0; for(auto &[u, v] : a){ answer += (x[u] - 1) * 1LL * (y[v] - 1); } cout << answer << endl; } signed main(){ ios_base::sync_with_stdio(false); cout.tie(nullptr); cin.tie(nullptr); //freopen("input.txt", "r", stdin); //freopen("output.txt", "w", stdout); int o_o = 1; //cin >> o_o; while(o_o --) SOLVE(); return 0; }
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